Date: Mon, 3 Jul 2006 13:45:49 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: David Xu <davidxu@freebsd.org> Cc: freebsd-performance@freebsd.org Subject: Re: Updated fine-grain locking patch for UNIX domain sockets Message-ID: <20060703134429.P57091@fledge.watson.org> In-Reply-To: <200607030837.04685.davidxu@freebsd.org> References: <20060630001142.Y67344@fledge.watson.org> <200607030837.04685.davidxu@freebsd.org>
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On Mon, 3 Jul 2006, David Xu wrote: > I found 5% performance decrease on dual P4, maybe P4 is quite bad when doing > atomic operation. ;-) Thanks, When I've measured, generally, yes, P4 performance has been abysmal for synchronization operations, both atomic operations and CPU-local interrupt disabling, etc. I suspect rwlocks could use a bit of optimization in the contention case. I've not dug into the code, so I'm not clear how they compare with respect to adaptive behavior. Robert N M Watson Computer Laboratory University of Cambridge
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